CN203431406U

CN203431406U - Restriction orifice

Info

Publication number: CN203431406U
Application number: CN201320526157.9U
Authority: CN
Inventors: 黄瑞鹤; 上官宗剑; 陈显笋; 林敏�; 洪晨君
Original assignee: CANGNAN AUTOMATION INSTRUMENT FACTORY
Current assignee: CANGNAN AUTOMATION INSTRUMENT FACTORY
Priority date: 2013-08-27
Filing date: 2013-08-27
Publication date: 2014-02-12
Anticipated expiration: 2023-08-27

Abstract

The utility model relates to a restriction orifice which comprises an orifice body. The restriction orifice is characterized in that a plurality of through holes are formed in the orifice body, and the specific value of the length of each through hole in the axial direction and the diameter of each through hole is larger than or equal to 12. According to the technical scheme, outlets of the through holes are not prone to cavitation, pressure drop is large, noise is small and vibration is small.

Description

A kind of restriction orifice

Technical field

The utility model relates to a kind of device for limit fluid flow, reduction hydrodynamic pressure, particularly a kind of restriction orifice.

Background technique

Restriction orifice is widely used in the industries such as thermoelectricity, nuclear power, oil, chemical industry, rock gas, and restriction orifice is arranged in pipeline, for the flow of limit fluid or the pressure of reduction fluid, thereby reaches pressure and the flow needing.

Traditional restriction orifice has generally comprised plate body, described plate body central position is provided with a circular hole, circular hole one end is entrance point, the other end is outlet end, but, this traditional restriction orifice, excessive in pressure drop, fluid closes on critical flow, during the operating modes such as fluid is unstable, fluid tends to produce flash distillation, cavitation and cavitation phenomenons, this phenomenon may cause the vibration of pipeline high frequency high-amplitude, cause at short notice wash surface badly damaged, and the very large noise of generation, in a lot of industrial systems, ducts and pipes crisscross, pipe network gathers, faint pipe vibration can not bring infringement to equipment, but stronger vibration may cause damage and even the unplanned stoppage in transit of unit to equipment, pipe vibration and noise can make field personnel produce fear, discomfort and sense of insecurity, scatter operation personnel's attention, affect working efficiency, and easily produce operate miss, cause the accident, strong pipe vibration can make pipeline configuration, pipeline fittings produces fatigue ruption, pipe insulation comes off, the weld seam of pipeline and elbow gently cause leakage, heavy set off an explosion by breaking, burning, cause serious accident, even cause disaster.

Summary of the invention

The purpose of this utility model: in order to overcome the defect of prior art, the utility model provides a kind of restriction orifice, and its through hole outlet port is difficult for cavitation, and pressure drop is large, noise is little, vibrates little.

The technical solution of the utility model: a kind of restriction orifice, include plate body, it is characterized in that: described plate body is provided with some through holes, described through hole is more than or equal to 12 along the ratio of its axial length and its diameter.

Adopt technique scheme, when fluid is flowed through through hole, circulation area reduces, flow velocity increases, hydrodynamic pressure reduces, and when pressure is reduced to fluid critical pressure, will produce cavitation, under large pressure drop operating mode, each through hole inside of restriction orifice all produces cavitation phenomenon, produces thus vapour-liquid two-phase, and the time stopping in through hole is long, two obtain thermodynamical equilibrium mutually, thereby make through hole outlet port be difficult for cavitation, and adopt porous design, cavitation intensity is shared and weakened, thereby noise and vibration are reduced greatly, and pressure drop can reach very large.

Further setting of the present utility model: described through hole one end is entrance point, the other end is outlet end, the entrance point of through hole is provided with chamfering.

Adopt above-mentioned further setting, the chamfering of setting, can weaken the blockage effect of fluid in through hole, has reduced fluid by the Peak Flow Rate of through hole, has reduced to produce in through hole the intensity of cavitation.

Further setting more of the present utility model: the central shaft of through hole and plate body central axes arrange, and the central shaft of described through hole winding board body is provided with some circles, and the central shaft of the through hole winding board body in every circle is uniformly distributed.

Adopt above-mentionedly further to arrange again, the through hole set-up mode of this structure, make through hole stressed, washed away more evenly, the power that fluid produces in through hole is more even, has reduced greatly vibration and noise.

Further setting of the present utility model: described plate body is arranged with body outward, and described body two ends are welded with respectively flange plate.

Adopt above-mentioned further setting, the flange plate of setting can conveniently be installed restriction orifice.

Accompanying drawing explanation

Fig. 1 is the structure sectional view of the utility model specific embodiment;

Fig. 2 is the plan view of the utility model specific embodiment;

Fig. 3 is I part partial enlarged drawing in Fig. 1;

Fig. 4 is the utility model specific embodiment and flange plate, pipe connection structure schematic diagram.

Embodiment

As shown in Figure 1, a kind of restriction orifice, include plate body 1, described plate body 1 is provided with some through holes 2, the central shaft of through hole 2 and plate body 1 central axes setting, described through hole 2 is more than or equal to 12 along the ratio of its axial length and its diameter, like this when fluid is flowed through through hole 2, circulation area reduces, flow velocity increases, hydrodynamic pressure reduces, when pressure is reduced to fluid critical pressure, will produce cavitation, under large pressure drop operating mode, each through hole 2 inside of restriction orifice all produce cavitation phenomenon, produce thus vapour-liquid two-phase, the time stopping in through hole is long, two obtain thermodynamical equilibrium mutually, thereby make through hole outlet port be difficult for cavitation, and the design of employing porous, cavitation intensity is shared to be weakened, thereby noise and vibration are reduced greatly, and pressure drop can reach very large.

As shown in Figure 1,3, in the utility model specific embodiment, described through hole 2 one end are entrance point 21, the other end is outlet end 22, and the entrance point 21 of through hole 2 is provided with chamfering 211, and this chamfering 211 can be also circular arc chamfering for chamfer, the chamfering 211 arranging, can weaken the blockage effect of fluid in through hole 2, reduce fluid by the Peak Flow Rate of through hole 2, reduce the intensity of the interior generation cavitation of through hole 2.

As shown in Figure 2, in the utility model specific embodiment, the central shaft of described through hole 2 winding board bodies 1 is provided with some circles, the central shaft of the through hole 2 winding board bodies 1 in every circle is uniformly distributed, through hole 2 set-up modes of this structure, make through hole stressed, washed away more evenly, fluid is more even in the power of through hole 2 interior generations, has reduced greatly vibration and noise.

As shown in Figure 4, in the utility model specific embodiment, described plate body 1 is outer is arranged with body 3, and described body 3 two ends are welded with respectively flange plate 4, and the flange plate 4 of setting can conveniently be installed restriction orifice.

Claims

1. a restriction orifice, includes plate body, it is characterized in that: described plate body is provided with some through holes, and described through hole is more than or equal to 12 along the ratio of its axial length and its diameter.

2. restriction orifice according to claim 1, is characterized in that: described through hole one end is entrance point, and the other end is outlet end, and the entrance point of through hole is provided with chamfering.

3. restriction orifice according to claim 1 and 2, is characterized in that: the central shaft of through hole and plate body central axes arrange, and the central shaft of described through hole winding board body is provided with some circles, and the central shaft of the through hole winding board body in every circle is uniformly distributed.

4. restriction orifice according to claim 1 and 2, is characterized in that: described plate body is arranged with body outward, and described body two ends are welded with respectively flange plate.

5. restriction orifice according to claim 3, is characterized in that: described plate body is arranged with body outward, and described body two ends are welded with respectively flange plate.